US 12,113,552 B2
Delta-sigma modulator
Kazuma Ohara, Tokyo (JP)
Assigned to Asahi Kasei Microdevices Corporation, Tokyo (JP)
Filed by Asahi Kasei Microdevices Corporation, Tokyo (JP)
Filed on Dec. 14, 2022, as Appl. No. 18/066,276.
Claims priority of application No. 2021-211074 (JP), filed on Dec. 24, 2021; and application No. 2022-172922 (JP), filed on Oct. 28, 2022.
Prior Publication US 2023/0208436 A1, Jun. 29, 2023
Int. Cl. H03M 3/00 (2006.01); H03M 3/02 (2006.01)
CPC H03M 3/466 (2013.01) [H03M 3/43 (2013.01); H03M 3/464 (2013.01); H03M 3/02 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A delta-sigma modulator comprising:
a first integral unit configured to integrate an input analog signal;
a second integral unit configured to integrate a signal output by the first integral unit;
a quantizer configured to quantize a signal output by the second integral unit;
a digital-to-analog (DA) converter configured to perform DA conversion on an output of the quantizer and output a feedback signal to be fed back to the first integral unit; and
a control unit configured to perform control to cause the first integral unit and the second integral unit to perform different integral operations during a first period and a second period, wherein
the second integral unit is configured to receive the feedback signal output by the DA converter via the first integral unit and integrate the feedback signal during the first period and the second period, and
the control unit is configured to control the second integral unit to be caused to operate as an integrator in which a feedback coefficient during the second period is higher than a feedback coefficient during the first period.